1. S. A. Zimov, S. P. Davidov, S. F. Prosiannikov, North-East Scientific Station, Pacific Institute for Geography, Far-East Branch, Russian Academy of Sciences, Republic of Sakha, Yakutia, 678830 Cherskii, Russia.
2. Y. V. Voropaev and I. P. Semiletov, Pacific Oceanographic Institute, Far-East Branch, Russian Academy of Sciences, Vladivostok, Russia.
3. F. S. Chapin III and M. C. Chapin, Department of Integrative Biology, University of California, Berkeley, CA 94720–3140, USA.
4. S. Trumbore and S. Tyler, Department of Earth System Sciences, University of California, Irvine, CA 92697–3100, USA.